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By Dra O
posted a while back - it was running at one point - I have all the plastic shroud off - it's down to frame and engine now
-fuel pump: when line from petcock is attached, no fuel comes out other side to carb; the line to the carb is open (can blow through it); I thought when I cranked engine that the pump would spit out fuel on other side but it does not; I removed fuel pump and opened it up - diaphragm looks good - but internal areas had lotsa calcification build up - I cleaned this out and dried it good - the clear plastic pieces (?diaphragms) aren't broken - the spring w/ steel ball on end moves freely; am putting it back on tomorrow; but can anyone answer about the pump? isn't it supposed to pump fuel through it... to other side... to carb? puzzling
-along with fuel pump: I replaced petcock 3 weeks ago (gas tank had rusty fuel in bottom - cleaned it out prior to new petcock); when I turn petcock arrow NOT to on or reserve, fuel comes out of line; when I turn it to on or reserve, fuel doesn't come out; puzzling
-I don't know what's on back of fuel pump - it's a valve that has a hose coming out of it - looks like it goes to engine/carb - I haven't traced this out yet - what is it?
-can squirt gas on air filter and engine will run for 2-3 seconds then stop - fuel in top of carb (under diaphragm) does same
-it likely needs carb rebuild - will get to this - but something isn't allowing fuel to get from fuel pump to carb
-I THINK it has a mikuni model x carb - diaphragm is ID 26mm OD 68mm - hard to find inexpensive diaphragm, I guess because it's a model x
-last thing - I replaced solenoid due to old one clicking; I HAVE to be charging the battery or it won't start/turn over - battery just goes dead; but if charging, it'll turn over nicely; i'm guessing it's a bad battery
-any help appreciated - I've never owned an ATV before - inherited this beast from grandparent in-law
I got a 1994 yamaha timberwolf that 2 years ago i bought put carb on off a parts one had it running but not the best so i rebuilt the carb seemed to run good then i left it sit i wanted to ride it so,i took carb apart to clean it looked good had it running but wouldn't idle not a big deal then it died so i gave up on now trying to start wont do anything i checked spark looks good, has great compression and its getting gas i sprayed starter fluid in it and it still wont do anything what the heck could be wrong?
By Cj Winds
I have a 2000 Polaris Xplorer with the 250 two stroke motor
It does not want to start with the electric start, the motor cranks fast, the battery is good, and there is good spark when cranking. The engine starts perfect when using the pull cord, it even starts if I pull the cord slowly and starts with one pull. The engine idles smoothly once started. My wife says she needs the electric start to work.
I was given a 2008 Yamaha Timberwolf by my in laws a few weeks back. Of course my FIL said it hasn’t run in 8 years but all it needs is gas and oil!
That hasn’t been the case...so far I’ve replaced the spark plug, changed air filter, replaced battery, replaced fuel and oil filters, fresh oil and gas. I tried starting her up and no luck, it turns over but won’t get going.
Now I’ve moved on to cleaning the carburetor which I’ve heard is a common problem area. I can’t figure out how to remove the bowl at the bottom, any suggestions? I removed the four screws that I thought were holding it in place but the bowl won’t budge
Thanks and looking forward to getting her running!
Some photos of what I’ve got going on , this has taken over the garage
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By Christopher Williams
i just rebuilt the top end of a 99 Bear Tracker 250 and it can’t get it to hit off of gasoline or starter fluid. Occasionally it will backfire. Right now I’m just trying to get it to fire off without the carburetor like I’ve done a thousand times before with other engines. Usually there is no response, but occasionally I get a backfire through the intake. ISeems like it’s out of time, but I don’t see how that could be possible.
Here’s what I know:
1. compression 120psi
2. all timing marks are lined up after numerous revolutions.
3. Strong spark.
4. Valves adjusted correctly.
Thanks in advance.
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